Tetra Tech, Inc. (NASDAQ: TTEK) announced today it has been awarded three indefinite delivery indefinite quantity (IDIQ) contracts with the U.S. General Services Administration (GSA). The One Acquisition Solution for Integrated Services (OASIS) contracts are designed as vehicles to address all federal agencies’ needs for a full range of service requirements that integrate multiple professional service disciplines. The multiple-award contracts are for a five-year base period with a five-year option and are open to all federal agencies with an unlimited ceiling value.

Under the OASIS contracts, Tetra Tech has been selected to perform services in three primary areas: 1) Engineering, Environmental, Management Consulting; 2) Engineering for Military and Aerospace Equipment; and 3) Research and Development in the Physical, Engineering, and Life Sciences.

“Tetra Tech has demonstrated experience providing integrated professional services for the U.S. Department of Defense and a variety of civil service federal agencies,” said Dan Batrack, Tetra Tech Chairman and CEO. “We have managed 27 multiple-award IDIQ contracts for GSA with more than $700 million in task orders in the past five years. These new awards provide additional access and capacity to our large portfolio of contracts with the federal government.”

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services. The Company supports government and commercial clients by providing innovative solutions to complex problems focused on water, environment, energy, infrastructure, and natural resources. With 14,000 employees worldwide, Tetra Tech’s capabilities span the entire project life cycle.

Any statements made in this release that are not based on historical fact are forward-looking statements. Any forward-looking statements made in this release represent management’s best judgment as to what may occur in the future. However, Tetra Tech’s actual outcome and results are not guaranteed and are subject to certain risks, uncertainties and assumptions ("Future Factors"), and may differ materially from what is expressed. For a description of Future Factors that could cause actual results to differ materially from such forward-looking statements, see the discussion under the section "Risk Factors" included in the Company’s Form 10-K and 10-Q filings with the Securities and Exchange Commission.